/usr/share/php/kohana3.1/modules/cache/classes/kohana/ is in libkohana3.1-mod-cache-php 3.1.5-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/apc.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/arithmetic.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/eaccelerator.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/exception.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/file.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/garbagecollect.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/memcache.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/memcachetag.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/sqlite.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/tagging.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/wincache.php
/usr/share/php/kohana3.1/modules/cache/classes/kohana/cache/xcache.php